Module Communications Network System Ford Taurus X I

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is used for diagnostic use only, and CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking is a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires combining the signals on a single network. Information is sent to the individual control modules that control each function.

The vehicle has 3 module communication networks

1. ISO 9141
2. Medium speed (MS) CAN
3. High speed (HS) CAN

All 3 networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on the 3 networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio control module (ACM).

Scheme 1

ISO 9141 Network Operation

The ISO 9141 communications network is a single wire network. The ISO 9141 communication network is used only by the PAM (if equipped).

MS-CAN Operation

The MS-CAN communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.

The MS-CAN is a medium speed communication network used for the following modules

1. Accessory protocol interface module (APIM)
2. Audio control module (ACM)
3. Driver seat module (DSM) (if equipped)
4. HVAC module
5. Instrument cluster (IC)
6. Liftgate/trunk module (LTM) (if equipped)
7. Rear entertainment module (RETM) (if equipped)
8. Satellite digital audio receiver system (SDARS) module (if equipped)
9. Smart junction box (SJB)

HS-CAN Operation

The HS-CAN communicates using bussed messages. The HS-CAN uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.

The HS-CAN is a high speed communication network used for the following modules

1. ABS module
2. APIM
3. IC
4. Occupant classification system module (OCSM)
5. PCM
6. Power steering control module (PSCM)
7. Restraints control module (RCM)
8. 4X4 control module (if equipped)

Network Termination

The CAN uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast, in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With two termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms.

Network termination improves bus message reliability by

1. stabilizing bus voltage.
2. eliminating electrical interference.

Gateway Module

The IC is the gateway module, translating HS-CAN to MS-CAN and vice versa. This information allows a message to be distributed throughout both networks. The IC is the only module on this vehicle that has this ability.

Special Tools Illustration Tool Name Tool Number 73III Automotive Meter 105-R0057 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit 105-R025C or equivalent

Scheme 2

Scheme 3

Principles of Operation

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is used for diagnostic use only, and CAN is a method for transferring data among distributed electronic modules via a serial data bus.

The vehicle is equipped with 3 module communication networks

1. ISO 9141
2. Medium speed (MS) CAN
3. High speed (HS) CAN

ISO 9141 Communications Network

The ISO 9141 communications network is a single wire network. The ISO 9141 communications network does not permit intermodule communication and is used for diagnostic use only. The only module on the ISO 9141 network is the PAM. When the scan tool communicates to the PAM, the scan tool must request all information, the module cannot initiate communications.

The following fault chart describes the specific ISO 9141 network failures and their resulting symptom

ISO 9141 NETWORK COMMUNICATION FAULT CHART

MS-CAN

The MS-CAN uses an unshielded twisted pair cable of data (+) and data (-) circuits. The data (+) and the data (-) circuits are each regulated to approximately 2.5 volts during neutral or rested network traffic. As bus messages are sent on the data (+) circuit, voltage is increased by approximately 1.0 volt. Inversely, the data (-) circuit is reduced by approximately 1.0 volt when a bus message is sent. Multiple bus messages can be sent over the network CAN circuits allowing multiple modules to communicate with each other. The MS-CAN is used for the IC, the accessory protocol interface module (APIM) the smart junction box (SJB), the driver seat module (DSM), the ACM, the SDARS module, the rear entertainment module (RETM), the liftgate/trunk module (LTM), and the HVAC module communications, and designed for general information transfer. The MS-CAN will not communicate while certain faults are present, but will operate with diminished performance with other faults present. The MS-CAN bus may remain operational when 1 of the 2 termination resistors are not present.

In the event that one of the 2 network circuits (MS-CAN + or MS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result. The module to which the network circuit is open may repeatedly send network messages indicating there has been partial data received. This type of message is referred to as a negative-acknowledge (NACK) message. Repeated NACK messages may "load" the network with too much activity causing intermittent no communication to other network modules and/or the scan tool.

The following fault chart describes the specific MS-CAN failures and their resulting symptom

MS-CAN COMMUNICATION FAULT CHART

HS-CAN

The HS-CAN uses an unshielded twisted pair cable of data (+) and data (-) circuits. The data (+) and the data (-) circuits are each regulated to approximately 2.5 volts during neutral or rested network traffic. As bus messages are sent on the data (+) circuit, voltage is increased by approximately 1.0 volt. Inversely, the data (-) circuit is reduced by approximately 1.0 volt when a bus message is sent. Multiple bus messages can be sent over the network CAN circuits allowing multiple modules to communicate with each other. The HS-CAN is a high speed communication network used for the IC, the accessory protocol interface module (APIM), the PCM, the steering effort control module (SECM), the 4X4 control module, the restraints control module (RCM) the occupant classification system module (OCSM), and the ABS module communications, and designed for real time information transfer and control. The HS-CAN will not communicate while certain faults are present, but will operate with diminished performance with other faults present. The HS-CAN bus may remain operational when 1 of the 2 termination resistors are not present.

In the event that one of the 2 network circuits (HS-CAN + or HS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result. The module to which the network circuit is open may repeatedly send network messages indicating there has been partial data received. This type of message is referred to as a negative-acknowledge (NACK) message. Repeated NACK messages may "load" the network with too much activity causing intermittent no communication to other network modules and/or the scan tool.

The following fault chart describes the specific HS-CAN failures and their resulting symptom

HS-CAN COMMUNICATION FAULT CHART

The following chart describes the specific CAN messages broadcast by each module, and the module(s) that receive the message

CAN MODULE COMMUNICATION MESSAGE CHART

Inspection and Verification

1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage. VISUAL INSPECTION CHART Electrical Battery junction box (BJB) fuse(s): 23 (10A) (no communication with the PCM) 29 (30A) (no communication with the liftgate/trunk module [LTM]) 32 (30A) (no communication with the driver seat module [DSM]) 38 (10A) (no communication with the ABS module) 47 (15A) (no communication with the PCM) Smart junction box (SJB) fuse(s): 3 (15A) (no communication with the accessory protocol interface module [APIM], satellite digital audio receiver system [SDARS] module, rear entertainment module [RETM]) 5 (10A) (no communication with the SJB) 11 (10A) (no communication with the 4X4 control module) 12 (7.5A) (no communication with the DSM) 13 (5A) (no communication with the steering effort control module [SECM]) 14 (10A) (no communication with the LTM) 15 (10A) (no communication with the heating ventilation air conditioning [HVAC] module) 20 (15A) (no power to scan tool) 26 (10A) (no communication with the instrument cluster [IC]) 29 (5A) (no communication with the IC) 32 (10A) (no communication with the restraints control module [RCM]) 35 (10A) (no communication with the parking aid module [PAM], SECM) 37 (10A) (no communication with the HVAC module) 39 (20A) (no communication with the audio control module [ACM]) 41 (15A) (no communication with the ACM) 46 (7.5A) (no communication with the RCM, occupant classification system module [OCSM]) Data link connector (DLC) Wiring harness Wiring, terminals or connectors
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the scan tool to the DLC. If the scan tool does not communicate with the VCM: Check the VCM connection to the vehicle. Check the scan tool connection to the VCM. Go to «Pinpoint Test Q»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-q-no-power-to) , to diagnose no power to the scan tool.
5. Carry out the network test. If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6. If the network test fails, go to «Symptom Chart»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system) to identify the module not communicating.
6. If the DTCs retrieved are related to the concern, go to DTC Tables. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article.
7. If no DTCs related to the concern are retrieved, go to «Symptom Chart»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system) .

DTC Tables

Note. Network DTCs (U-codes) are often a result of intermittent concerns such as faulty wiring or low battery voltage occurrences. Additionally, vehicle service procedures such as module reprogramming will often set network DTCs. Replacing a module to resolve a network DTC is unlikely to resolve the concern. To prevent repeat network DTC concerns, inspect all network wiring, especially connectors. Test the vehicle battery, refer to BATTERY, MOUNTING AND CABLES article.

COMMUNICATION NETWORK DTC TABLE

Symptom Chart

Symptom Chart

Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM SYSTEM WIRING DIAGRAMS articleS article, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Electronic Engine Controls - 3.5L for schematic and connector information.

Normal Operation

The PCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the PCM. The PCM shares the HS-CAN with the steering effort control module (SECM), the ABS module, the restraints control module (RCM), the 4X4 control module, the accessory protocol interface module (APIM) and the instrument cluster (IC). Voltage and ground for the PCM is provided by redundant circuits. Circuit CBB47 (GN/BU) provides voltage, and circuit GD113 (BK/YE) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. PCM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.

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1. A1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? YES : Go to A2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. A2 POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS (PC/ED) PINPOINT TEST QA VERIFICATION Verify that PC/ED pinpoint test QA has been carried out. Has pinpoint test QA been carried out? YES : Go to A3 . NO : REFER to the «Introduction - Gasoline Engines»(/ford/taurus-x/i-2007-2009/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article, pinpoint test QA to diagnose no communication with the PCM.
3. A3 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Disconnect the scan tool from the DLC. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to A5 . NO : Go to A4 .
4. A4 CHECK THE CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Disconnect: PCM C175b Measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to A5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. A5 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(/ford/taurus-x/i-2007-2009/remont/removal-installation/#electronic-engine-control-system) article. CONNECT all the modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all the modules. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Vehicle Dynamic Systems for schematic and connector information.

The ABS module communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the ABS module. The ABS module shares the HS-CAN with the PCM, the steering effort control module (SECM), the restraints control module (RCM), the occupant classification system module (OCSM), the 4X4 control module, the accessory protocol interface module (APIM) and the instrument cluster (IC). Voltage for the ABS module is provided by circuit CBB38 (GY/BU), and ground is provided by circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ABS module

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 8

Scheme 9

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Scheme 11

1. B1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: ABS Module C135 Key in ON position. Measure the voltage between the ABS module C135-32, circuit CBB38 (GY/BU), harness side and ground. Is the voltage greater than 10 volts? YES : Go to B2 . NO : VERIFY the smart junction box (SJB) fuse 38 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. B2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the ABS module C135-38, circuit GD120 (BK/GN), harness side and ground. Is the resistance less than 5 ohms? YES : Go to B3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. B3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE ABS MODULE FOR AN OPEN Measure the resistance between the ABS module C135-26, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the ABS module C135-14, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to B4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. B4 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ABS module. REFER to «VEHICLE DYNAMIC SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/anti-locktraction-control/#anti-lock-brake-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test C: The Instrument Cluster (IC) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Instrument Cluster for schematic and connector information.

The instrument cluster (IC) communicates with the scan tool through the high speed controller area network (HS-CAN) and the medium speed controller area network (MS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN connection to the IC and circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the MS-CAN connection to the IC. Voltage for the IC is provided by circuits CBP29 (WH/VT) and 1566 (RD/YE). Circuit GD111 (BK/BU) provides ground.

The IC shares the HS-CAN with the following modules

1. PCM
2. Steering effort control module (SECM)
3. ABS module
4. Restraints control module (RCM)
5. 4X4 control module
6. Accessory protocol interface module (APIM)

The IC shares the MS-CAN with the following modules

1. Audio control module (ACM)
2. Rear entertainment module (RETM)
3. Driver seat module (DSM)
4. HVAC module
5. Accessory protocol interface module (APIM)
6. Liftgate/trunk module (LTM)
7. Satellite digital audio receiver system (SDARS) module
8. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

1. Fuse(s)
2. Wiring, terminals or connectors
3. IC

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 12

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1. C1 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Disconnect the scan tool cable from the data link connector (DLC). Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to C2 . NO : Go to C4 .
2. C2 CHECK THE IC VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Disconnect: IC C220 Connect the battery ground cable. Key in ON position. Measure the voltage between the IC, harness side and ground as follows: Connector-Pin Circuit C220-1 SBP26 (YE/RD) C220-14 CBP29 (WH/VT) Are the voltages greater than 10 volts? YES : Go to C3 . NO : VERIFY the smart junction box (SJB) fuses 26 (10A) or 29 (5A) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. C3 CHECK THE IC GROUND CIRCUITS Key in OFF position. Measure the resistance between the IC, harness side and ground as follows: Connector-Pin Circuit C220-6 GD111 (BK/BU) C220-20 GD113 (BK/YE) Are the resistances less than 5 ohms? YES : Go to C4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. C4 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE IC FOR AN OPEN Measure the resistance between the IC C220-7, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the IC C220-8, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to C5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. C5 CHECK THE MS-CAN CIRCUITS BETWEEN THE DLC AND THE IC FOR AN OPEN Measure the resistance between the IC C220-4, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the IC C220-5, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to C6 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
6. C6 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new IC. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/taurus-x/i-2007-2009/remont/gauges-instrument-panels/#information-center) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test D: The 4X4 Control Module Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, All Wheel Drive (AWD) for schematic and connector information.

The 4X4 control module communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the 4X4 control module. The 4X4 control module shares the HS-CAN with the PCM, the accessory protocol interface module (APIM), the steering effort control module (SECM), the ABS module, the restraints control module (RCM), occupant classification system module (OCSM) and the instrument cluster (IC). Voltage for the 4X4 control module is provided by circuit CBP34 (VT/BN) and SBP11 (BU/RD). Ground is provided by circuit GD148 (BK/YE).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. 4X4 control module

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 16

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Scheme 19

1. D1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: 4X4 Control Module C281 Key in ON position. Measure the voltage between the 4X4 control module C281-4, circuit CBP34 (VT/BN), harness side and ground; and between the 4X4 control module C281-5, circuit SBP11 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to D2 . NO : VERIFY the smart junction box (SJB) fuses 34 (5A) and 11 (10A) are OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. D2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the 4X4 control module C281-15, circuit GD148 (BK/YE), harness side and ground. Is the resistance less than 5 ohms? YES : Go to D3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. D3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE 4X4 CONTROL MODULE FOR AN OPEN Measure the resistance between the 4X4 control module C281-3, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the 4X4 control module C281-11, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to D4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. D4 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION Disconnect the 4X4 control module connector. Check for: corrosion damaged pins pushed-out pins Connect the 4X4 control module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new 4X4 control module. REFER to «FOUR WHEEL DRIVE (4WD) SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/transfer-case/#transfer-case-four-wheel-drive-4wd-systems) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test E: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Supplemental Restraint System for schematic and connector information.

The RCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the RCM. The RCM shares the HS-CAN with the PCM, the accessory protocol interface module (APIM), the steering effort control module (SECM), the ABS module, the 4X4 control module, the occupant classification system module (OCSM) and the instrument cluster (IC). Voltage for the RCM is provided by circuit CBP32 (GN/VT), and the RCM is case grounded.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Case ground open
4. RCM

Note. The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.

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1. E1 CHECK THE RCM CONNECTION Key in OFF position. Depower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. Disconnect: RCM C310a Disconnect: RCM C310b Inspect the RCM connector for damaged, pushed out or corroded pins. Are RCM C310a pin 24, and RCM C310b pins 17 and 18 OK? YES : Go to E2 . NO : REPAIR the RCM connector pins as necessary. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. E2 CHECK THE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector. Repower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. Key in ON position. Measure the voltage between the RCM C310a-24, circuit CBP32 (GN/VT), harness side and ground. Is the voltage greater than 10 volts? YES : Go to E3 . NO : VERIFY the smart junction box (SJB) fuse 32 (10A) is OK. If OK, REPAIR the circuit. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. E3 CHECK THE RCM CASE GROUND Key in OFF position. Measure the resistance between the RCM case and a good chassis ground. Is the resistance less than 5 ohms? YES : Go to E4 . NO : REPAIR the RCM case ground as necessary. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. E4 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE RCM FOR AN OPEN Measure the resistance between the RCM C310b-18, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the RCM C310b-17, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to E5 . NO : REPAIR the circuit in question. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. E5 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new RCM. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test F: The Occupant Classification System Module (OCSM) Does Not Respond With the Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Supplemental Restraint System for schematic and connector information.

The occupant classification system module (OCSM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the OCSM. The OCSM shares the MS-CAN with the smart junction box (SJB), the accessory protocol interface module (APIM), the driver seat module (DSM), the HVAC module, the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module, and the instrument cluster (IC). Voltage for the OCSM is provided by circuit CBP46 (WH/BU). Circuit GD133 (BK) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. OCSM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 23

Scheme 24

Scheme 25

Scheme 26

1. F1 CHECK THE ACM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: OCSM C3285 Key in ON position. Measure the voltage between the OCSM C3285-1, circuit CBP46 (WH/BU), harness side and ground. Is the voltage greater than 10 volts? YES : Go to F2 . NO : VERIFY the smart junction box (SJB) fuse 46 (7.5A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. F2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the OCSM C3285-14, circuit GD133 (BK), harness side and ground. Is the resistance less than 5 ohms? YES : Go to F3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. F3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE OCSM FOR AN OPEN Measure the resistance between the OCSM C3285-18, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the OCSM C3285-9, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to F4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. F4 CHECK FOR CORRECT OCSM OPERATION Disconnect the OCSM connector. Check for: corrosion damaged pins pushed-out pins Connect the OCSM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new OCSM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test G: The Steering Effort Control Module (SECM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Power Steering Controls for schematic and connector information.

The steering effort control module (SECM) communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the steering effort control module (SECM). The steering effort control module (SECM) shares the HS-CAN with the PCM, the accessory protocol interface module (APIM), the ABS module, the restraints control module (RCM), the occupant classification system module (OCSM), the 4X4 control module and the instrument cluster (IC). Voltage for the steering effort control module (SECM) is provided by circuits SBP13 (GY/RD) and CBP35 (YE/GY) and circuit GD148 (BK/YE) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. SECM

Note. Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 27

Scheme 28

Scheme 29

Scheme 30

1. G1 CHECK THE SECM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: SECM C2368a Key in ON position. Measure the voltage between the steering effort control module (SECM) C2368a-11, circuit SBP13 (GY/RD), harness side and ground; and between the steering effort control module (SECM) C2368a-3, circuit CBP35 (YE/GY), harness side and ground. Are the voltages greater than 10 volts? YES : Go to G2 . NO : VERIFY the smart junction box (SJB) fuses 13 (5A) or 35 (10A), are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. G2 CHECK THE SECM GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the steering effort control module (SECM) C2368a-14, circuit GD148 (BK/YE), harness side and ground. Is the resistance less than 5 ohms? YES : Go to G3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. G3 CHECK THE HS-CAN CIRCUITS BETWEEN THE SECM AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Measure the resistance between the steering effort control module (SECM) C2368a-10, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the steering effort control module (SECM) C2368a-9, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to G4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. G4 CHECK FOR CORRECT SECM OPERATION Disconnect all the steering effort control module (SECM) connectors. Check for: corrosion damaged pins pushed-out pins Connect all the steering effort control module (SECM) connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new steering effort control module (SECM). REFER to «STEERING SYSTEM - GENERAL INFORMATION»(/ford/taurus-x/i-2007-2009/remont/manual-power-steering/#steering-system-general-information) article . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Grounds for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Power Distribution/SJB for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

The smart junction box (SJB) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SJB. The SJB shares the MS-CAN with the HVAC module, the accessory protocol interface module (APIM), the audio control module (ACM), the driver seat module (DSM), the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module, the liftgate/trunk module (LTM) and the instrument cluster (IC). Voltage for the SJB is provided by redundant circuits. Fuse 5 (10A) provides voltage, and circuit GD133 (BK) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. SJB

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 31

Scheme 32

Scheme 33

1. H1 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in ON position. NOTE: Measurements are taken with the fuses installed. Measure the voltage between the SJB fuse 5 (10A) and ground. Is the voltage greater than 10 volts? YES : Go to H2 . NO : VERIFY the smart junction box (SJB) fuse 5 (10A) is OK. If OK, go to H4 .
2. H2 CHECK THE SJB GROUND CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: SJB C2280d Measure the resistance between the SJB, harness side and ground, as follows: SJB Connector-Pin Circuit C2280d-8 GD133 (BK) C2280d-12 GD133 (BK) Are the resistances less than 5 ohms? YES : Go to H3 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. H3 CHECK THE MS-CAN CIRCUITS BETWEEN THE SJB AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Disconnect: SJB C2280b Measure the resistance between the SJB C2280b-37, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280b-38, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to H4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. H4 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test I: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Audio System/Navigation for schematic and connector information.

The audio control module (ACM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (HS-CAN +) and VDB07 (VT/OG) (HS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN with the HVAC module, the accessory protocol interface module (APIM), the smart junction box (SJB), the driver seat module (DSM), the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module, the liftgate/trunk module (LTM) and the instrument cluster (IC). Voltage for the ACM is provided by circuit SPB39 (WH/RD) and circuit GD103 (BK/BU) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ACM

Note. Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. I1 CHECK THE ACM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: ACMC240a Key in ON position. Measure the voltage between the ACM C240a-1, circuit SPB39 (WH/RD) , harness side and ground. Is the voltage greater than 10 volts? YES : Go to I2 . NO : VERIFY the smart junction box (SJB) fuse 39 (20A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. I2 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the ACM C240a-13, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to I3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. I3 CHECK THE MS-CAN CIRCUITS BETWEEN THE ACM AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Disconnect: ACMC240c Measure the resistance between the ACM C240c-15, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the ACM C240c-16, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to I4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. I4 CHECK FOR CORRECT ACM OPERATION Disconnect all of the ACM connectors. Check for: corrosion damaged pins pushed-out pins Connect all of the ACM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ACM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test J: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Memory Seats for schematic and connector information.

The driver seat module (DSM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DSM. The DSM shares the MS-CAN with the smart junction box (SJB), the accessory protocol interface module (APIM), the HVAC module, the audio control module (ACM), the liftgate/trunk module (LTM), the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module, and the instrument cluster (IC). Voltage and ground for the DSM is provided by circuits SBB32 (VT/RD) and SBP12 (GN/RD). Circuits GD147 (BK/VT) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. DSM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. J1 CHECK THE DSM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: DSM C341a Disconnect: DSM C341b Measure the voltage between the DSM C341a-1, circuit SBB32 (VT/RD), harness side and ground. Measure the voltage between the DSM C341b-1, circuit SBP12 (GN/RD), harness side and ground. Are the voltages greater than 10 volts? YES : Go to J2 . NO : VERIFY the battery junction box (BJB) fuse 32 (30A) or the SJB fuse 12 (7.5) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. J2 CHECK THE DSM GROUND CIRCUIT FOR AN OPEN Measure the resistance between the DSM C341a-2, circuit GD147 (BK/VT), harness side and ground. Measure the resistance between the DSM C341b-24, circuit GD147 (BK/VT), harness side and ground. Are the resistances less than 5 ohms? YES : Go to J3 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. J3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE DSM FOR AN OPEN Key in OFF position. Disconnect: DSM C241d Measure the resistance between the DSM C341d-10, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the DSM C341d-9, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to J4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. J4 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test K: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Audio System/Navigation for schematic and connector information.

The rear entertainment module (RETM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the RETM. The RETM is only on vehicles equipped with rear seat entertainment. The RETM shares the MS-CAN with the smart junction box (SJB), the accessory protocol interface module (APIM), the audio control module (ACM), the HVAC module, the driver seat module (DSM), the satellite digital audio receiver system (SDARS) module, the liftgate/trunk module (LTM), and the instrument cluster (IC). Voltage for the RETM is provided by circuit SBP03 (BU/RD). Ground is provided by circuit GD103 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. RETM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 44

Scheme 45

Scheme 46

Scheme 47

1. K1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: RETM C9029 Measure the voltage between the RETM C9029-16, circuit SBP03 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to K2 . NO : VERIFY the smart junction box (SJB) fuse 3 (15A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. K2 CHECK THE GROUND CIRCUIT FOR AN OPEN Measure the resistance between the RETM C9029-1 circuit GD103 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to K3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. K3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE RETM FOR AN OPEN Measure the resistance between the RETM C9029-8, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the RETM C9029-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to K4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. K4 CHECK FOR CORRECT RETM OPERATION Disconnect the RETM connector. Check for: corrosion damaged pins pushed-out pins Connect the RETM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new RETM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test L: The Liftgate/Trunk Module (LTM) Does Not Respond With The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Power Liftgate for schematic and connector information.

The liftgate/trunk module (LTM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the LTM. The LTM shares the MS-CAN with the smart junction box (SJB), the accessory protocol interface module (APIM), the audio control module (ACM), the HVAC module, the driver seat module (DSM), the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module and the instrument cluster (IC). Voltage for the LTM is provided by circuits SBB29 (GY/RD) and SBP14 (BN/RD). Ground is provided by circuit GD147 (BK/VT).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. LTM

PINPOINT TEST L: THE LIFTGATE/TRUNK MODULE (LTM) DOES NOT RESPOND TO THE SCAN TOOL

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 48

Scheme 49

Scheme 50

Scheme 51

1. L1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: LTM C4174b Key in ON position. Measure the voltage between the LTM C4174b-4, circuit SBB29 (GY/RD), harness side and ground; measure the voltage between the LTM C4174b-9, circuit SBP14 (BN/RD) harness side and ground. Are the voltages greater than 10 volts? YES : Go to L2 . NO : VERIFY the smart junction box (SJB) fuse 14 (10A) or BJB fuse 29 (30A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. L2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the LTM C4174b-1, circuit GD147 (BK/VT), harness side and ground. Is the resistance less than 5 ohms? YES : Go to L3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. L3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE LTM FOR AN OPEN Disconnect: LTM C4174a Measure the resistance between the LTM C4174a-11, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the LTM C4174a-10, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to L4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. L4 CHECK FOR CORRECT LTM OPERATION Disconnect the LTM connector. Check for: corrosion damaged pins pushed-out pins Connect the LTM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new LTM. REFER to «BODY CLOSURES»(/ford/taurus-x/i-2007-2009/remont/exterior-body-panels/#body-panel-system-body-closures) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Audio System/Navigation for schematic and connector information.

The satellite digital audio receiver system (SDARS) module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SDARS module. The SDARS module shares the MS-CAN with the smart junction box (SJB), the accessory protocol interface module (APIM), the audio control module (ACM), the HVAC module, the driver seat module (DSM), the rear entertainment module (RETM), the liftgate/trunk module (LTM) and the IC. Voltage for the SDARS module is provided by circuit SBP03 (BU/RD). Ground is provided by circuit GD103 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. SDARS module

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. M1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: SDARS module C4344 Measure the voltage between the SDARS module C4344-9, circuit SBP03 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to M2 . NO : VERIFY the smart junction box (SJB) fuse 3 (15A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. M2 CHECK THE GROUND CIRCUIT FOR AN OPEN Measure the resistance between the SDARS module C4344-3, circuit GD103 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to M3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. M3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE SDARS MODULE FOR AN OPEN Measure the resistance between the SDARS module C4344-1, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SDARS module C4344-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to M4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. M4 CHECK FOR CORRECT SDARS module OPERATION Disconnect the SDARS module connector. Check for: corrosion damaged pins pushed-out pins Connect the SDARS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SDARS module. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test N: The Heating Ventilation Air Conditioning (HVAC) Module Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Manual Climate Control System for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Automatic Climate Control System for schematic and connector information.

The HVAC module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the HVAC module. The HVAC module shares the MS-CAN with the smart junction box (SJB), the ACM, the driver seat module (DSM), the rear entertainment module (RETM), the SDARS module, the liftgate/trunk module (LTM) and the instrument cluster (IC). Voltage for the HVAC module is provided by circuits CBP37 (WH) and SBP15 (WH/RD). Circuit GD111 (BK/BU) provides ground.

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. HVAC module

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 56

Scheme 57

Scheme 58

Scheme 59

1. N1 CHECK THE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: HVAC-EATC Module C228a or HVAC-EMTC module C2357a Key in ON position. Measure the voltage between the HVAC-EATC module C228a-12 or HVAC-EMTC module C2357a-12, circuit CBP37 (WH), harness side and ground; and between the HVAC-EATC module C228a-13 or HVAC-EMTC module C2357a-13, circuit SBP15 (WH/RD), harness side and ground. Are the voltages greater than 10 volts? YES : Go to N2 . NO : VERIFY the SJB fuses 15 (10A) or 37 (10A) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. N2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the HVAC-EATC module C228a-23 or HVAC-EMTC module C2357a-23, circuit GD111 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to N3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. N3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DLC AND THE HVAC MODULE FOR AN OPEN Measure the resistance between the HVAC-EATC module C228a-25 or HVAC-EMTC module C2357a-25, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the HVAC-EATC module C228a-26 or HVAC-EMTC module C2357a-26, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to N4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. N4 CHECK FOR CORRECT HVAC MODULE OPERATION Disconnect all the HVAC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the HVAC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test O: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

The accessory protocol interface module (APIM) communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN connection to the APIM. Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the MS-CAN connection to the APIM. Voltage for the APIM is provided by circuit SBP03 (BU/RD). Circuit GD103 (BK/BU) provides ground.

The APIM shares the HS-CAN with the following modules

1. PCM
2. Steering effort control module (SECM)
3. ABS module
4. Occupant classification system module (OCSM)
5. Restraints control module (RCM)
6. 4X4 control module
7. Instrument cluster (IC)

The APIM shares the MS-CAN with the following modules

1. Audio control module (ACM)
2. Rear entertainment module (RETM)
3. Driver seat module (DSM)
4. HVAC module
5. Instrument cluster (IC)
6. Liftgate/trunk module (LTM)
7. Satellite digital audio receiver system (SDARS) module
8. Smart junction box (SJB)

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. APIM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 60

Scheme 61

Scheme 62

Scheme 63

Scheme 64

Scheme 65

1. O1 CHECK THE APIM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Disconnect: APIM C3342 Key in ON position. Measure the voltage between the APIM C3342-1, circuit SBP03 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to O2 . NO : VERIFY the smart junction box (SJB) fuse 13 (15A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. O2 CHECK THE APIM GROUND CIRCUITS FOR AN OPEN Key in OFF position. Measure the resistance between the APIM C3342-37, circuit GD103 (BK/BU), harness side and ground; and between the APIM C3342-38, circuit GD103 (BK/BU), harness side and ground. Are the resistances less than 5 ohms? YES : Go to O3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. O3 CHECK THE HS-CAN CIRCUITS BETWEEN THE APIM AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN Measure the resistance between the APIM C3342-53, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the APIM C3342-54, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to O4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. O4 CHECK THE MS-CAN CIRCUITS BETWEEN THE DLC AND THE APIM FOR AN OPEN Measure the resistance between the APIM C3342-16, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the APIM C3342-17, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to O5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. O5 CHECK FOR CORRECT APIM OPERATION Disconnect all the APIM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the APIM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new APIM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test P: The Parking Aid Module (PAM) Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Parking Aid for schematic and connector information.

The parking air module (PAM) communicates with the scan tool through the International Standards Organization (ISO) 9141 communications network, circuit VDB10 (GY). Voltage for the PAM is provided by circuit CBP35 (YE/GY). Ground is provided by circuit GD147 (BK/YE) or GD148 (BK/YE).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Parking aid module

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Scheme 66

Scheme 67

Scheme 68

1. P1 CHECK THE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN Key in OFF position. Disconnect: PAM C3267 Key in ON position. Measure the voltage between the PAM C3267-1, circuit CBP35 (YE/GY), harness side and ground. Is the voltage greater than 10 volts? YES : Go to P2 . NO : VERIFY the smart junction box (SJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. P2 CHECK THE GROUND CIRCUIT FOR AN OPEN Key in OFF position. Measure the resistance between the PAM C3267-4, circuit GD147 (BK/YE) or GD148 (BK/YE), harness side and ground. Is the resistance less than 5 ohms? YES : Go to P3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. P3 CHECK ISO 9141 CIRCUIT VDB10 (GY) FOR AN OPEN Measure the resistance between the PAM C3267-8, circuit VDB10 (GY), harness side and the DLC C251-7, circuit VDB10 (GY), harness side. Is the resistance less than 5 ohms? YES : Go to P4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. P4 CHECK FOR CORRECT PAM OPERATION Disconnect the PAM connector. Check for: corrosion damaged pins pushed-out pins Connect the PAM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new PAM. REFER to «PARKING AID»(/ford/taurus-x/i-2007-2009/remont/collisionavoidance/#parking-aid-system) article. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test Q: No Power To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

The scan tool is connected to the data link connector (DLC) to communicate with the high speed controller area network (HS-CAN), medium speed controller area network (MS-CAN), and International Standards Organization (ISO) 9141 communication network. Voltage for the scan tool is provided by circuit SBP20 (GN/RD). Ground is provided by circuit GD111 (BK/BU).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. Scan tool

Scheme 69

1. Q1 CHECK DLC PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test. Disconnect the scan tool cable from the DLC. Inspect DLC pins 4, 5 and 16 for damage. Are DLC pins 4, 5 and 16 OK? YES : Go to Q2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. Q2 CHECK THE VOLTAGE SUPPLY CIRCUIT TO THE DLC Measure the voltage between the DLC C251-16, circuit SBP20 (GN/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to Q3 . NO : VERIFY the smart junction box (SJB) fuse 20 (15A) is OK. If OK, REPAIR the circuit. REPEAT the network test with the scan tool.
3. Q3 CHECK THE DLC GROUND CIRCUITS FOR AN OPEN Measure the resistance between the DLC C251-4 and C251-5, circuits GD111 (BK/BU), harness side and ground. Are the resistances less than 5 ohms? YES : REPAIR the scan tool. REPEAT the network test with the scan tool. NO : REPAIR the circuit in question. REPEAT the network test with the scan tool.

An open circuit VDB04 (WH/BU) (HS-CAN +) or VDB05 (WH) (HS-CAN -) may cause intermittent or unreliable communication to all modules on the HS-CAN. The following modules communicate on the HS-CAN

1. PCM
2. Accessory protocol interface module (APIM)
3. Steering effort control module (SECM)
4. ABS module
5. Restraints control module (RCM)
6. 4X4 control module
7. Instrument cluster (IC)
8. Occupant classification system module (OCSM)

In the event that one of the 2 network circuits (HS-CAN + or HS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors

PINPOINT TEST R: INTERMITTENT NO HIGH SPEED CONTROLLER AREA NETWORK (HS-CAN) COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST

Note. Various modules will set network DTCs during this test procedure. Clear the DTCs from all modules after the diagnostic procedure is complete.

Scheme 70

Scheme 71

1. R1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? YES : Go to R2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. R2 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to R3 . NO : Go to «Pinpoint Test Q»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-q-no-power-to) .
3. R3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : Go to R4 . NO : Go to «Pinpoint Test Q»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-q-no-power-to) .
4. R4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : Go to R5 .
5. R5 CHECK FOR RESTORED COMMUNICATION WITH THE PCM DISABLED NOTE: An integrated diagnostic system (IDS) session must be established prior to disabling the PCM in this test step. If the PCM has failed communication during multiple attempts to identify the vehicle, first identify the vehicle manually by entering a PCM part number, calibration number or tear tag when prompted by IDS. NOTE: When a vehicle is manually identified by a PCM part number, calibration number or tear tag, the IDS will not automatically run a network test. The network test must be manually selected and run. NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: Battery Junction Box (BJB) Fuses 23 (10A), 47 (15A) and 39 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test A»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-a-the-pcm-does) . NO : INSTALL the removed fuses. Go to R6 .
6. R6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ABS MODULE DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: Smart Junction Box (SJB) Fuse 38 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test B»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-b-the-abs-module) . NO : INSTALL the removed fuse. Go to R7 .
7. R7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SECM DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 13 (5A) and 35 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test G»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-g-the-steering-effort) . NO : INSTALL the removed fuses. Go to R8 .
8. R8 VERIFY VEHICLE EQUIPMENT - 4X4 CONTROL MODULE NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Inspect the vehicle for 4X4. Is the vehicle equipped with 4X4? YES : Go to R9 . NO : Go to R10 .
9. R9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE 4X4 CONTROL MODULE DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuses 34 (5A) and 11 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test D»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-d-the-4x4-control) . NO : INSTALL the removed fuses. Go to R10 .
10. R10 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 26 (10A) and 29 (5A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test C»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-c-the-instrument-cluster) . NO : INSTALL the removed fuses. Go to R11 .
11. R11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RCM DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 32 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test E»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-e-the-restraints-control) . NO : INSTALL the removed fuse. Go to R12 .
12. R12 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 46 (7.5A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test F»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-f-the-occupant-classification) . NO : Go to R13 .
13. R13 VERIFY VEHICLE EQUIPMENT - ACCESSORY PROTOCOL INTERFACE MODULE (APIM) NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Inspect the vehicle for an APIM. Is the vehicle equipped with an APIM? YES : Go to R14 . NO : INSTALL the removed fuse. An intermittent fault is not present. Go to «Pinpoint Test S»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-s-no-high-speed) .
14. R14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACCESSORY PROTOCOL INTERFACE MODULE (APIM) DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 3 (15A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test O»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-o-the-accessory-protocol) . NO : INSTALL the removed fuse. An intermittent fault is not present. Go to «Pinpoint Test S»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-s-no-high-speed) .

Pinpoint Test S: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Electronic Engine Controls - 3.5L for schematic and connector information.

Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN connection. The HS-CAN is used for network communication between the PCM, the steering effort control module (SECM), the ABS module, the restraints control module (RCM), occupant classification system module (OCSM), the 4X4 control module, the accessory protocol interface module (APIM) and the instrument cluster (IC).

This pinpoint test is intended to diagnose the following

1. Fuse
2. Wiring, terminals or connectors
3. ABS module
4. APIM
5. 4X4 control module
6. IC
7. OCSM
8. PCM
9. RCM
10. SECM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

1. S1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? YES : Go to S2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. S2 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to S3 . NO : Go to S5 .
3. S3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : Go to S4 . NO : Go to S21 .
4. S4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The CAN has tested within specifications. VERIFY the scan tool operation on a substitute vehicle and REPEAT the network test on the suspect vehicle.
5. S5 CHECK THE HS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? YES : Go to S6 . NO : Go to S9 .
6. S6 CHECK THE HS-CAN TERMINATION RESISTOR WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? YES : Go to S7 . NO : Go to S8 .
7. S7 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to S27 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
8. S8 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE IC FOR AN OPEN Disconnect: IC C220 Measure the resistance between the IC C220-7, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the IC C220-8, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to S35 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
9. S9 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S11 . NO : Go to S10 .
10. S10 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Measure the resistance between the PCM C175b-2, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-3, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to «Pinpoint Test R»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-r-intermittent-no-high) . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
11. S11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S12 . NO : CONNECT the battery ground cable. Go to S31 .
12. S12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C135 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S13 . NO : CONNECT the battery ground cable. Go to S32 .
13. S13 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SECM DISCONNECTED Disconnect: SECM C2368a Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S14 . NO : CONNECT the battery ground cable. Go to S33 .
14. S14 VERIFY VEHICLE EQUIPMENT - 4X4 CONTROL MODULE Inspect the vehicle for 4X4. Is the vehicle equipped with 4X4? YES : Go to S15 . NO : Go to S16 .
15. S15 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE 4X4 CONTROL MODULE DISCONNECTED Disconnect: 4X4 Control Module C281 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S16 . NO : CONNECT the battery ground cable. Go to S34 .
16. S16 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IC DISCONNECTED Disconnect: IC C220 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S17 . NO : CONNECT the battery ground cable. Go to S35 .
17. S17 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM DISCONNECTED Disconnect: RCM C310b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S18 . NO : CONNECT the battery ground cable. Go to S36 .
18. S18 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) DISCONNECTED Disconnect: OCSM C3285 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to S19 . NO : CONNECT the battery ground cable. Go to S37 .
19. S19 VERIFY VEHICLE EQUIPMENT - ACCESSORY PROTOCOL INTERFACE MODULE (APIM) Inspect the vehicle for an APIM. Is the vehicle equipped with an APIM? YES : Go to S20 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
20. S20 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED Disconnect: APIM C3342 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : CONNECT the battery ground cable. Go to S38 .
21. S21 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S31 . NO : Go to S22 .
22. S22 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C135 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S32 . NO : Go to S23 .
23. S23 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SECM DISCONNECTED Disconnect: SECM C2368a Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S33 . NO : Go to S24 .
24. S24 VERIFY VEHICLE EQUIPMENT - 4X4 CONTROL MODULE Inspect the vehicle for 4X4. Is the vehicle equipped with 4X4? YES : Go to S25 . NO : Go to S26 .
25. S25 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE 4X4 CONTROL MODULE DISCONNECTED Disconnect: 4X4 Control Module C281 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S34 . NO : Go to S26 .
26. S26 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IC DISCONNECTED Disconnect: IC C220 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S35 . NO : Go to S27 .
27. S27 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RCM DISCONNECTED Disconnect: RCM C310b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S36 . NO : Go to S28 .
28. S28 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE (OCSM) DISCONNECTED Disconnect: OCSM C3285 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S37 . NO : Go to S29 .
29. S29 VERIFY VEHICLE EQUIPMENT - ACCESSORY PROTOCOL INTERFACE MODULE (APIM) Inspect the vehicle for an APIM. Is the vehicle equipped with an APIM? YES : Go to S30 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery. CLEAR the DTCs. REPEAT the network test with the scan tool.
30. S30 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM DISCONNECTED Disconnect: APIM C3342 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to S38 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
31. S31 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(/ford/taurus-x/i-2007-2009/remont/removal-installation/#electronic-engine-control-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
32. S32 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ABS module. REFER to «VEHICLE DYNAMIC SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/anti-locktraction-control/#anti-lock-brake-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
33. S33 CHECK FOR CORRECT SECM OPERATION Disconnect the SECM connector. Check for: corrosion damaged pins pushed-out pins Connect the SECM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SECM. REFER to «POWER STEERING»(/ford/taurus-x/i-2007-2009/remont/manual-power-steering/#power-steering-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
34. S34 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION Disconnect the 4X4 control module connector. Check for: corrosion damaged pins pushed-out pins Connect the 4X4 control module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new 4X4 control module. REFER to «TRANSFER CASE - POWER TRANSFER UNIT (PTU)»(/ford/taurus-x/i-2007-2009/remont/transfer-case/#transfer-case-power-transfer-unit-ptu) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
35. S35 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new IC. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/taurus-x/i-2007-2009/remont/gauges-instrument-panels/#information-center) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
36. S36 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new RCM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
37. S37 CHECK FOR CORRECT OCSM OPERATION Disconnect the OCSM connector. Check for: corrosion damaged pins pushed-out pins Connect the OCSM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new OCSM. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(/ford/taurus-x/i-2007-2009/remont/airbag/#supplemental-inflatable-restraint-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
38. S38 CHECK FOR CORRECT APIM OPERATION Disconnect the APIM connector. Check for: corrosion damaged pins pushed-out pins Connect the APIM connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new APIM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.

The MS-CAN uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG). The following modules communicate on the MS-CAN

1. Audio control module (ACM)
2. Accessory protocol interface module (APIM)
3. Rear entertainment module (RETM)
4. Driver seat module (DSM)
5. HVAC module
6. Instrument cluster (IC)
7. Liftgate/trunk module (LTM)
8. Satellite digital audio receiver system (SDARS) module
9. Smart junction box (SJB)

In the event that one of the 2 network circuits (HS-CAN + or HS-CAN -) becomes open to a module on the network, unreliable network communication to all modules on the network may result.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors

PINPOINT TEST T: INTERMITTENT NO MEDIUM SPEED CONTROLLER AREA NETWORK (MS-CAN) COMMUNICATION, ONE OR MORE MODULES ARE NOT RESPONDING DURING NETWORK TEST

Note. Various modules will set network DTCs during this test procedure. Clear DTCs from all modules after the diagnostic procedure is completed.

Scheme 72

Scheme 73

Scheme 74

Scheme 75

1. T1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 3 and 11 for damage. Are DLC pins 3 and 11 OK? YES : Go to T2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. T2 CHECK THE MS-CAN TERMINATION RESISTANCE NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? YES : Go to T3 . NO : Go to «Pinpoint Test R»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-r-intermittent-no-high) .
3. T3 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : Go to T4 . NO : Go to «Pinpoint Test R»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-r-intermittent-no-high) .
4. T4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : Go to T5 .
5. T5 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SJB DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 5 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test H»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-h-the-smart-junction) . NO : INSTALL the removed fuse. Go to T6 .
6. T6 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE HVAC MODULE DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuses 15 (10A) and 37 (10A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test N»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-n-the-heating-ventilation) . NO : INSTALL the removed fuses. Go to T7 .
7. T7 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE ACM DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 39 (20A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. Go to «Pinpoint Test I»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-i-the-audio-control) . NO : INSTALL the removed fuse. Go to T8 .
8. T8 VERIFY VEHICLE EQUIPMENT - DRIVER SEAT MODULE (DSM) Inspect the vehicle for a DSM. Is the vehicle equipped with a DSM? YES : Go to T9 . NO : Go to T10 .
9. T9 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuses 32 (30A) and 12 (7.5A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test J»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-j-the-driver-seat) . NO : INSTALL the removed fuses. Go to T10 .
10. T10 VERIFY VEHICLE EQUIPMENT - LTM Inspect the vehicle for a LTM. Is the vehicle equipped with a LTM? YES : Go to T11 . NO : Go to T12 .
11. T11 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE LTM DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuses 14 (10A) and 29 (30A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test L»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-l-the-liftgatetrunk-module) . NO : INSTALL the removed fuses. Go to T12 .
12. T12 VERIFY VEHICLE EQUIPMENT - APIM, RETM AND/OR SDARS MODULE Inspect the vehicle for an APIM, RETM and/or a SDARS module. Is the vehicle equipped with an APIM, RETM and/or a SDARS module? YES : Go to T13 . NO : Go to T15 .
13. T13 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM AND/OR SDARS MODULE DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuse 3 (15A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuse. For vehicles equipped with two or more of the following modules: APIM, RETM or SDARS module, go to T14 . For vehicles equipped with an APIM only, go to «Pinpoint Test O»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-o-the-accessory-protocol) . For vehicles equipped with a RETM only, go to «Pinpoint Test K»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-k-the-rear-entertainment) . For vehicles equipped with a SDARS module only, go to «Pinpoint Test M»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-m-the-satellite-digital) . NO : INSTALL the removed fuse. Go to T17 .
14. T14 VERIFY VEHICLE EQUIPMENT - APIM Inspect the vehicle for an APIM. Is the vehicle equipped with an APIM? YES : Go to T15 . NO : Go to T16 .
15. T15 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM DISCONNECTED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: APIM C3342 Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : CONNECT the APIM. Go to «Pinpoint Test O»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-o-the-accessory-protocol) . NO : CONNECT the APIM. If the vehicle is equipped with a RETM, go to «Pinpoint Test K»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-k-the-rear-entertainment) . Otherwise, go to «Pinpoint Test M»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-m-the-satellite-digital) .
16. T16 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE RETM DISCONNECTED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: RETM C9029 Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : CONNECT the RETM. Go to «Pinpoint Test K»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-k-the-rear-entertainment) . NO : CONNECT the RETM. Go to «Pinpoint Test M»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-m-the-satellite-digital) .
17. T17 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IC DISABLED NOTE: When re-running the network test, the network test application must be first closed or the screen display will revert back to the prior run network test results. Disconnect: SJB Fuses 26 (10A) and 29 (5A) Enter the following diagnostic mode on the diagnostic tool: Network Test Repeat the network test. Do all other modules pass the network test? YES : INSTALL the removed fuses. Go to «Pinpoint Test C»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-c-the-instrument-cluster) . NO : INSTALL the removed fuses. An intermittent fault is not present. Go to «Pinpoint Test U»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#module-communications-network-system__pinpoint-test-u-no-medium-speed) .

Pinpoint Test U: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

Refer to appropriate SYSTEM WIRING DIAGRAMS article ARTICLE, Module Communications Network for schematic and connector information.

The medium speed controller area network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG). The smart junction box (SJB), the HVAC module, the audio control module (ACM), the driver seat module (DSM), the rear entertainment module (RETM), the satellite digital audio receiver system (SDARS) module, the liftgate/trunk module (LTM), the accessory protocol interface module (APIM) and the instrument cluster (IC) all communicate on the MS-CAN.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. ACM
3. APIM
4. DSM
5. RETM
6. HVAC module
7. IC
8. LTM
9. SDARS module
10. SJB

PINPOINT TEST U: PINPOINT TEST R: NO MEDIUM SPEED CONTROLLER AREA NETWORK (MS-CAN) COMMUNICATION, ALL MODULES ARE NOT RESPONDING

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

1. U1 CHECK DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test. Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 3 and 11 for damage. Are DLC pins 3 and 11 OK? YES : Go to U2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. U2 CHECK THE MS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? YES : Go to U5 . NO : Go to U3 .
3. U3 CHECK THE MS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 108 and 132 ohms? YES : Go to U7 . NO : Go to U4 .
4. U4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : If the vehicle is equipped with a DSM, go to U8 . Otherwise, go to U9 . NO : Go to U7 .
5. U5 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : Go to U6 . NO : If the vehicle is equipped with a DSM, go to U17 . Otherwise, go to U18 .
6. U6 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : VERIFY all module fuses are OK. If OK, REPEAT the network test with the scan tool.
7. U7 CHECK THE MS-CAN CIRCUITS BETWEEN THE DLC AND THE SJB FOR AN OPEN Disconnect: SJB C2280b Measure the resistance between the SJB C2280b-37, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280b-38, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : VERIFY all module fuses are OK. If OK, CONNECT all modules. REPEAT the network test with the scan tool. NO : REPAIR the circuit in question. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
8. U8 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DSM DISCONNECTED Disconnect: DSM C341d Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to U9 . NO : CONNECT the battery ground cable. Go to U27 .
9. U9 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SJB DISCONNECTED Disconnect: SJB C2280b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : If the vehicle is equipped with a RETM, go to U10 . Otherwise, go to U11 . NO : CONNECT the battery ground cable. Go to U24 .
10. U10 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RETM DISCONNECTED Disconnect: RETM C9029 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to U11 . NO : CONNECT the battery ground cable. Go to U28 .
11. U11 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE HVAC MODULE DISCONNECTED Disconnect: HVAC Module C228a (EATC) or C2357a (EMTC) Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : If the vehicle is equipped with a SDARS module, go to U12 . Otherwise, go to U13 . NO : CONNECT the battery ground cable. Go to U25 .
12. U12 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SDARS MODULE DISCONNECTED Disconnect: SDARS Module C4344 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to U13 . NO : CONNECT the battery ground cable. Go to U29 .
13. U13 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ACM DISCONNECTED Disconnect: ACM C240c Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : If the vehicle is equipped with a LTM, go to U14 . Otherwise, go to U15 . NO : CONNECT the battery ground cable. Go to U26 .
14. U14 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE LTM DISCONNECTED Disconnect: LTM C4174a Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to U15 . NO : CONNECT the battery ground cable. Go to U30 .
15. U15 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE IC DISCONNECTED Disconnect: IC C220 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : If the vehicle is equipped with an APIM, go to U16 . Otherwise, REPAIR the circuit in question. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : CONNECT the battery ground cable. Go to U33 .
16. U16 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE APIM DISCONNECTED Disconnect: APIM C3342 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : REPAIR the circuit in question. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : CONNECT the battery ground cable. Go to U34 .
17. U17 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE DSM DISCONNECTED Disconnect: DSM C341d Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U29 . NO : Go to U18 .
18. U18 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SJB DISCONNECTED Disconnect: SJB C2280b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U26 . NO : If the vehicle is equipped with a RETM, go to U19 . Otherwise, go to U20 .
19. U19 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RETM DISCONNECTED Disconnect: RETM C9029 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U30 . NO : Go to U20 .
20. U20 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE HVAC MODULE DISCONNECTED Disconnect: HVAC Module C228a (EATC) or C2357a (EMTC) Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U27 . NO : If the vehicle is equipped with a satellite digital audio receiver system (SDARS) module, go to U21 . Otherwise, go to U22 .
21. U21 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SDARS MODULE DISCONNECTED Disconnect: SDARS Module C4344 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U31 . NO : Go to U22 .
22. U22 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ACM DISCONNECTED Disconnect: ACM C240c Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U28 . NO : If the vehicle is equipped with a LTM, go to U23 . Otherwise, go to U24 .
23. U23 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE LTM DISCONNECTED Disconnect: LTM C4174a Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U32 . NO : Go to U24 .
24. U24 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IC DISCONNECTED Disconnect: IC C220 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : CONNECT the battery ground cable. Go to U33 . NO : If the vehicle is equipped with an APIM, go to U25 . Otherwise, REPAIR the circuit in question. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
25. U25 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM DISCONNECTED Disconnect: APIM C3342 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 1,000 ohms? YES : Go to U34 . NO : REPAIR the circuit in question. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
26. U26 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
27. U27 CHECK FOR CORRECT HVAC MODULE OPERATION Disconnect all the HVAC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the HVAC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new HVAC module. REFER to «CLIMATE CONTROL»(/ford/taurus-x/i-2007-2009/remont/manual-hvac-system/#hvac-control-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
28. U28 CHECK FOR CORRECT ACM OPERATION Disconnect all the ACM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the ACM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ACM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
29. U29 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/taurus-x/i-2007-2009/remont/communication-devices/#multifunction-electronic-modules-system) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
30. U30 CHECK FOR CORRECT RETM OPERATION Disconnect the RETM connector. Check for: corrosion damaged pins pushed-out pins Connect the RETM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new RETM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
31. U31 CHECK FOR CORRECT SDARS MODULE OPERATION Disconnect the SDARS module connector. Check for: corrosion damaged pins pushed-out pins Connect the SDARS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SDARS module. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
32. U32 CHECK FOR CORRECT LTM OPERATION Disconnect all the LTM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the LTM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new LTM. REFER to «BODY CLOSURES»(/ford/taurus-x/i-2007-2009/remont/exterior-body-panels/#body-panel-system-body-closures) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool.
33. U33 CHECK FOR CORRECT IC OPERATION Disconnect the IC connector. Check for: corrosion damaged pins pushed-out pins Connect the IC connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new IC. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/taurus-x/i-2007-2009/remont/gauges-instrument-panels/#information-center) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
34. U34 CHECK FOR CORRECT APIM OPERATION Disconnect the APIM connector. Check for: corrosion damaged pins pushed-out pins Connect the APIM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new APIM. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(/ford/taurus-x/i-2007-2009/remont/entertainment-systems/#information-system-and-entertainment-systems) article. CONNECT all modules. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

See also:
• MULTIFUNCTION ELECTRONIC MODULES
• BATTERY, MOUNTING AND CABLES
• VEHICLE DYNAMIC SYSTEMS
• INFORMATION AND ENTERTAINMENT SYSTEMS
• INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES
• HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS
• ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS)
• Introduction - Gasoline Engines
• ELECTRONIC ENGINE CONTROLS
• FOUR WHEEL DRIVE (4WD) SYSTEMS
• SUPPLEMENTAL RESTRAINT SYSTEM
• STEERING SYSTEM - GENERAL INFORMATION
• BODY CLOSURES
• CLIMATE CONTROL
• PARKING AID
• POWER STEERING
• TRANSFER CASE - POWER TRANSFER UNIT (PTU)
• Pinpoint Test Q
• Symptom Chart
• Pinpoint Test D
• Pinpoint Test C
• Pinpoint Test H
• Pinpoint Test E
• Pinpoint Test F
• Pinpoint Test N
• Pinpoint Test J
• Pinpoint Test L
• Pinpoint Test A
• Pinpoint Test B
• Pinpoint Test G
• Pinpoint Test I
• Pinpoint Test K
• Pinpoint Test M
• Pinpoint Test O
• Pinpoint Test P
• Pinpoint Test R
• Pinpoint Test S
• Pinpoint Test T
• Pinpoint Test U